Characteristics of excimer formation in langmuir-blodgett assemblies of 1-palmitoyl-2-pyrenedecanoylphosphatidylcholine and dipalmitoylphosphatidylcholine |
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| Institution: | Department of Membrane Physics, KSV Research Laboratories, SF-00380 Helsinki, Finland;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, People''s Republic of China;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, People''s Republic of China;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, People''s Republic of China |
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| Abstract: | Langmuir-Blodgett film alloys of PPDPC (1-palmitoyl-2-10-(pyren-1-yl)]decanoyl-sn-glycero-3-phosphocholine) and DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine) were assembled in varying molar proportions on quartz glass slides. The transferred layers were then characterized according to their pyrene excimer to monomer fluorescence intensity ratio iE/iM and fluorescence quantum yields as a function of film composition. The observed deviation from non-ideal mixing is considered to be due to the formation of regular distribution patterns of PPDPC in a DPPC lattice. The observed critical mole fractions of PPDPC evident as steps in IE/IM versus XPPDPC plots can be accounted for by a model involving a trigonal distribution of pyrenedecanoyl chains in the phospholipid acyl chain lattice. The implications of the distribution of PPDPC as superlattices to the excimer formation mechanism are discussed. |
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